I couldn't believe it when I, Thea Stilton, was invited to teach a journalism class at the prestigious Mouseford Academy! Once I arrived I met five amazing students. And when another student disappeared it was up to us to help solve the mystery. Holey Swiss cheese, it was an incredible adventure!

Mouldy mozzarella! A flock of sheep at Nicky's family's Australian ranch was losing all its wool and no-one knew why. Nick and her friends, the Thea Sisters, headed to Australia and set off on a tour of the whole country in search of clues. What happened next turned out to be a truly remarkable outback adventure!Meet the Thea Sisters!

There's a haunted shipwreck off Whale Island and a rare diamond was lost when the ship sank. When the Thea Sisters' biology professor disappears, the mice have to dive deep into the ocean to find him — and hopefully recover the priceless jewel! And just when they think their adventures are over, the five mice are invited to China to search for another lost treasure!Meet the Thea Sisters!

When Paulina gets a phone call from home telling her that a friend is missing the Thea Sisters travel to Peru to help solve the mystery. There, the five mice climb the Andes Mountains in search of a missing archaeologist. Along the way, they stumble upon clues leading them to a mysterious hidden city. Will the Thea Sisters find Paulina’s friend - and the treasure of the Secret City?Meet the Thea Sisters!

When Collete invites her friends to come home with her to Paris for spring break the five mice are delighted. While they're in France they'll even get to attend Collete's fashion-designer cousin Julie's runway show at the Eiffel Tower! But soon after the Thea Sisters arrive, Julie's designs are stolen. Will the five mice be able to catch the thief in time to save the fashion show?Meet the Thea Sisters!

The Thea Sisters are off to Japan on a cultural exchange program. While they’re busy exploring Kyoto andadmiring
the beautiful cherry blossoms a valuable item is stolen from their
friend Kumi’s family. Will the five mice be able to catch the thief?

The Thea Sisters are headed on a fabumouse mission... to the moon! After much preparation the mice blast off. But when they arrive at their lunar vacation spot things start to go wrong, including spaceship wrecks and rebellious robots. Can the Thea Sisters figure out what’s going on and save the day?Meet the Thea Sisters!

The Thea Sisters travel to New York to cheer for Nicky as she runs the Big Apple Marathon. While there they visit Pamela’s family and have a delicious dinner at the family’s pizzeria. But when someone threatens to burn the restaurant down can the Thea Sisters catch the troublemaker and solve the mystery?

The Thea Sisters travel to Alaska
for a conference held by the Green Mice, an ecological association.
While there the Thea Sisters discover that someone is upsetting the
ecosystem by blowing up the ice with explosives! Can the Thea Sisters
stop the destruction and save the ice?Meet the Thea Sisters!

The Thea Sisters have been invited to Egypt to participate in a fabumouse archaeological excavation. While there the mouselings are excited to find a huge monolith with a blue scarab on it. But they also discover that thieves are after the hidden treasure of the temple. It's up to the Thea Sisters to stop them!

When the Thea Sisters' friend Ashvin is in trouble they rush to his aid... in India! Ashvin has been working to return the monkeys living in the big city to their natural jungle environment. But the monkeys have suddenly started stealing jewels! Can the Thea Sisters figure out who is behind the terrible theft?

The Thea Sisters are boarding the famouse Orient Express for a journey from Paris to Istanbul! The train is a special trip to return a precious wedding dress stolen years ago from an Istanbul museum. But there's a rumour that the mysterious Acrobat Thief will steal the gown from the moving train! The Thea Sisters are determined to foil this smoky mouse's plans.